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substitution cipher


from Wiktionary, Creative Commons Attribution/Share-Alike License

  • n. a method of encryption by which units of plaintext are substituted with ciphertext according to a regular system; the "units" may be single letters (the most common), pairs of letters, triplets of letters, mixtures of the above, and so forth. The receiver deciphers the text by performing an inverse substitution.


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  • Secret writing, where the letters of the text are replaced by substitute letters, without transposing them. (from WordCraft)

    May 21, 2008